NTFS_BUF_SIZE
buf = ntfs_calloc(NTFS_BUF_SIZE);
size = min(end - pos, NTFS_BUF_SIZE);
char buf[NTFS_BUF_SIZE];
memset(buf, -1, NTFS_BUF_SIZE);
if (count > NTFS_BUF_SIZE)
count = NTFS_BUF_SIZE;